OpenSER module exec

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exec module allows to start an external command from an OpenSER script. The commands may be any valid shell commands--the command string is passed to shell using "popen" command. OpenSER passes additionally lot of information about request in environment variables:

SIP_HF_<hf_name> contains value of each header field in request. If a header field occurred multiple times, values are concatenated and comma-separated. <hf_name> is in capital letters. Ff a header-field name occurred in compact form, <hf_name> is canonical.

SIP_TID is transaction identifier. All request retransmissions or CANCELs/ACKs associated with a previous INVITE result in the same value.

SIP_DID is dialog identifier, which is the same as to-tag. Initially, it is empty.

SIP_SRCIP is source IP address from which request came.

SIP_ORURI is original request URI.

SIP_RURI is current request URI (if unchanged, equal to original).

SIP_USER is userpart of current request URI.

SIP_OUSER is userpart of original request URI.

In OpenSER 1.2.0, the commands to be executed can be composed with pseudo-variable, in this way is possible to give arguments to command.

exec_msg() can be used to execute command, the output of command being ignored. exec_dset() gets each line from command output and sets destination set (R-URI and branches). exec_avp() gets each line from command output and add as AVPs.